fix yabbler file writing not working on macosx

joel reported this issue and i hope to fix it with this

js: "/Users/JoelS/code/moo/hack/gamejs/utils/yabbler/yabbler.js", 
line 131:                                                
The choice of Java constructor write matching JavaScript argument types                                                  
([B) is ambiguous; candidate constructors are:                                                                             
    void write(byte[])                                                                                                     
    void write(int)